Journal
APPLIED SPECTROSCOPY
Volume 58, Issue 8, Pages 929-933Publisher
SAGE PUBLICATIONS INC
DOI: 10.1366/0003702041655430
Keywords
Raman; protein; peptide; amino acid; buffer; fluorescence; segregation; purification
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A new application of the recently described drop coating deposition Raman (DCDR) method facilitates the segregation and independent spectral characterization of mixture components. The quality of the normal (un-enhanced) Raman spectra are significantly improved as a result of reduced spectral interference from fluorescent impurities and buffer compounds. Fluorescence of commercial amino acid (O-phospho-L-serine) and protein (myoglobin) samples is reduced by over an order of magnitude using DCDR, more effectively than prolonged photo-bleaching. Furthermore, DCDR is used to obtain high-quality Raman spectra of proteins, lysozyme, and insulin, derived from solutions with up to 1000-fold excess buffer concentration. Possible thermodynamic and kinetic contributions to the observed segregation phenomena are discussed.
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